"B...both!" Kyle blurted out. He didn't know why he said that; he knew he should have said dare, but he felt compelled. The tent in his shorts evidently thought for him. He stared at Jen's huge cock as it stirred again, her expression turning to a devilish grin.
"Perfect...." she said, Kyle's gaze remaining fixed on her genitalia. "For your transformation, Kyle, you're going to become my living fuck toy." Her cock surged forward, pressing against her chest, but she didn't care. Kyle gulped.
"Wh-what do you mean?"
Jen took a step forward, her huge cock bouncing against her torso as it lurched again.
"Well, you're going to tutn into a clydesdale mare from the waist down. Same size as me. Except I don't want you fighting back, so you'll lose those pesky arms of yours. You'll also become hypermobile and extremely flexible, so if I want, I can grab your shoulders while I mount you and make you make eye contact, and so you can lick yourself clean after I'm done with you. Your tongue will grow extremely thick and long, and you'll constantly drool if you let it hang. You'll be able to squeeze it down your throat and into your abdomen for storage though." Her cock throbbed. Kyle was pale as a sheet.
"I'm not done," she continued, a squirt of pre jumping from her as her cock pressed into Kyle 2 feet ahead of her. "You'll be able to unhinge your jaw, never choking from taking my full length. In fact. you'll never need to eat or breathe again; my cum will sustain you, and it'll be the only thing you can consume. Fresh from the tap, of course." She shoved her cock hard against his face as he backed against the porch railing, pinned by her massive member. He gulped as he realized its head nearly dwarfed his own....
"You'll also gain cute horse ears, and huge, full breasts. I want you to titfuck me too, after all, seeing as you're going to be my new personal fucktoy. Your horse rear will be nice and plump, and it'll jiggle as you trot. Gives me something to look at and smack, you toy. You'll also be stuck at a 90 degree angle like me, makes you easier to fuck."
Kyle whined in fear and pain as the huge cock pushed him harder against the railing. Jen was frantic now, grinding against him faster and faster.
"Don't worry, you'll never get pregnant, but you will be in permanent heat. Plus, your equine vagina will stretch so deep that when I'm fully in you, the head of my dick will push that huge tongue of yours clear out of your mouth. No one but us will remember you were ever anything else, Kyle. No one. You'll have always been my fucktoy, following me around wherever I go, begging me for attention."
She paused, grinding even harder against Kyle for a second as she prepared the second half of his curse.
"For your dare, I dare you to never use the curse on me again, or use it to change your transformation."
With one final lurch against Kyle's trembling torso, Jen came hard. Kyle shuddered as he stepped back, and took a few trembling steps onto Jen's lawn. She had front row seats as his legs began to twitch, swelling through his cargo shorts.
Suddenly they burst apart as grey-speckled fur covered Kyle's growing thighs. Through his tears he grew in height, matching Jen. A new tail swung behind him as a sickening crunch snapped through the air, his spine now parallel to the ground. His ass plumped up, becoming shapely, feminine, and almost human. He looked up at Jen with tears streaming down his face as his arms went limp and sucked into his t-shirt. She could hardly hide her pleasure as that t-shirt then tore from his torso, huge plump, pendulous breasts bursting forth and swaying under him. They pulled his body side to side as he stumbled forward, balancing on his two hooves as his fat equine ass jiggled behind him. His mouth suddenly swelled as his tongue pushed out, growing until it was nearly 4 feet long. His jaw popped loudly as it unhinged, his tongue as thick around as a 2-liter soda bottle at its base, tapering to a more human end. With a wet gulp he sucked it into himself, his neck swelling briefly before it settled into a belly-like pouch in his abdomen, leaving copious amounts of saliva dripping from his mouth. His ears shifted, becoming furry and pointed, signifying the end of his transformation.
Jen gripped the limp but still meter-long member flopping beneath her torso and hoisted it towards him. Kyle's eyes followed it hungrily as his tongue eagerly licked up the cum Jen had already splattered on him. It tasted so good, better than anything he'd ever eaten before. He was so horny, and so exhausted. His stomach ached from the transformation, his energy sapped. He needed food. He needed cum.
"Is somebody hungry?" Jen asked, smirking, as Kyle licked his lips, practically lunging for her cock as she trotted out into the yard.